Speed-governor for elevators



Patented Nov. 29, 1887. I

(No Model.)

W. E. NIGKERSON.

SPEED GOVERNOR FOR ELEVATORS, 650.

IIE

' \K/ITIJEEE E5- STATES PATENT OFFIcE.

WILLIAM E. NIOKERSON, CAMBRIDGE, MASSACHUSETTS.

" SPEED-GOVERNOR FORELEYATORS, 8 o.

SPECIFICATION forming partof Letters Patent No. 374,080, dated Nove mber29, 1887.

Application filed June 27, 1887.

To all whont it may concern:

T Be it'k nown that LWILLIAM E. NIoKERsoN, of Cambridge, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Speed-Governors,

V of which the following, taken in connection with the accompanying drawings, is a specitication. 7 f

My invention relates to thatclass ofdevices in which a fluid is used for checking or regulating the speed of machines, the object being 'to so arrange passages in a piston that a fluid will pass freely through when the said piston is moving slowly, or at its normal speed, but be checked or restricted in its flow when the piston moves at a velocity greater than that required or desired for the proper working of the machine. This object I attain by the mechanism shown in the accompanyingdraw- ,ings, in which- Figure 1 is a cross vertical section of my device, and Fig. 2 is a plan of the same.

.The device that I have drawn is more especially adapted for use'in connection with an tached circular disks E E, by means of screws SSSS.

Serial No. 242,691. (No model.)

Packing'rings are represented by K K K, Fig. 1.

In the piston I form a series of passages,

one of which is indicated by the letters P P P P P P, Fig. 1. Each passage begins on the lower side of the piston at P, and travers; ing, as shown, forms a tortuous passage and 'opens on the upper side of the piston at P.

For convenience of construction I make the piston of the three parts D, E, and E. This method allows the parts I and P of the passage to be cut or planed out, which is perhaps the cheapest way that the work can be, U

done.

I do not wishto confine myself to any particular construction, as that may be varied as desired; nor do I wish to be confined to any peculiar characteristic of form of passage, as any tortuous passage will do. provided it has abrupt turns, so as to cause the current of the passing fluid to so interfere with itself as to I WILLIAM E. NIoKERsoN.

Witnesses:

FRANK G. PARKER, HENRY MARSH. 

